Tire-protector and auxiliary tread.



A. G. BOIVIN ISL F. J. DAVIGNONL TIRE PROTECTOR AND AUXILIARY TREAD.APPLICATION FILED OCT. 2. 1911.

1,260,506. I Patented Mar. 26,1918.

SHEET 1.

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A. G. BOIVIN 64 F. J. DAVIGNONI TIRE PROTECTOR AND AUXILIARY TREAD.

APPLICATION FILED OCT. 2. 1917.

1 ,QGQfiUGI Patented Mar. 26, 1918.

2 SHEETS-SHEET 2.

BY 7 WTORNEY WTEED snares rnrnnr ARCADE G. BOIVIN, OF COHOES, ANDFREDERICK J. DAVIGNON, 0F TROY, NEV

YORK.

TIRE-PROTECTOR AND AUXILIARY TBEAD.

'naeosoe.

Specification of Letters Patent.

Patented Mar. 26, 1918..

Application filed October 2, 1917. Serial No. 194,386.

To all whom it may concern:

Be it known that we, ARCADE Gr. Borvm, residing at Cohoes, in the countyof Albany and State of New York, and FREDERICK J. DAVIGNON, residing atTroy, in the county of Rensselaer'and State of New York, have inventedcertain new and useful Improve ments in Tire-Protectors and AuxiliaryTreads, of which the following is a specification.

Our invention has for its object to provide an improved device forencircling'the tread face of a pneumatic tire and sustaining anauxiliary tread of solid rubber or rubber and fabric, the deviceincluding two like half ring-clamps and each half clamp is provided withan arcuate or concaved surface to fit over the tread face of thepneumatic tire and project to near the middle transverse line thereof toprotect the pneumatic tire from stone bruises and cuts; each half clampalso includes a half tread-rim portion having a clencher flange at theouter side from which flange the tread face of the rim slants toward thecenter and inwardly, the two half ring-clamps having outside channels inwhich the heads of the securing bolts and nuts are located andprotected, the bolts passing transversely through the half ring-clampsand function to draw the same together to efiectually clamp them on theinflated tire and at the same time cause the flanges to tightly grip thebeaded solid tire, which is held seated in the rim-channel formed by theopposed half clamp members.

Our invention also provides means for preventing slip between theinflated tire and the half clamp members by serrating the inner face ofthe half clamp members and providing a space between the opposed ormeeting faces of the body portions of the half clamp members, wherebythey may be drawn together with considerable lateral pressure to squeezethe solid tire and cause it' to engage the rim surface with retainingfriction.

The invention also includes those novel details of construction,combination and arrangement of parts, all of which will be first fullydescribed, then be specifically pointed out in the appended claims andillustrated in the accompanying drawings, in which:

Figure 1 is a perspective view of a wheel with the invention applied.

Fig. 2 is a cross section on the line 2-2 of Fig. 1, showing theposition of the half clamp members, the auxiliary tread and thepneumatic tire just prior to applying the Igltimping pressure bytightening up on the Fig. 3 is a view'similar to Fig. 2 showing theparts in the final or secured position.

Fig. i is a view, on a small scale, similar to Fig. 3, showing how theinflated tire is protected against lateral stone bruises or cuts, by theprotection aflorded through the medium of the non-yieldable (rigid) halfclamp members.

Fig. 5 is a cletailelevation showing the inner side of a portion of oneof the half clamp members and showing the serrations.

Fig. 6 is a perspective view and part section of a portion of one of thehalf clamp members showing the serrated face.

In the drawings, in which like letters and numerals of referenceindicate like parts in allof the figures, 1 represents the pneumatictire which is of the usual construction and, per se, constitutes no partof the present invention.

The present invention comprises two half clamp members 2, each ofidentically the same cross sectional form, and each comprising a bodyportion 3 of as small a depth as possible, consistent with rigidity andsufiicient space to provide the bolt holes through which the fasteningbolts 11 are passed, the half clamp members also including the sideflanges 9 which extend toward the horizontal middle line of thepneumatic tire some distance beyond the normal area of the normal treadsurface of the tire when running under load with proper inflation (seedot and dash line A for the width of the normal tread or ground engagingsurface). Each half clamp member also has a concaved face 4 extendingfrom the central vertical face 10 of the body portion 3 to the extremityof the flange 9 and this surface 4 is preferably serrated as at 5 toinsure adequate frictional engagement with the pneumatic tire to preventcreeping or slipping when the parts are 1n operation.

Each half clamp member also has a rim 'and annular rim tread face 6 andit has side clencher flanges 7 the tread face 6 slanting from theclencher flanges 7 inwardly toward the central plane of the tire, asbest shown in Figs. 2 and 3 of the drawing.

In order to secure the half clamp members together, we provide bolts 11with nuts v 12 and where the bolt heads and the nuts j is made normallyslightly wider than the normal tread face of the pneumatic tire so thatwhen the parts are applied to the pneumatic tire and clamped up tightly,the auxiliary tread member 13 will be laterally com pressed to presentonly a width substantially equal to the normal tread face of the tire,thus not presenting to the ground any greater degree of road frictionthan is ordinarily presented by the pneumatic tire and hence a drag onthe engine power by abnormal road contact is avoided, and at the sametime the compressing strains applied by the clamping action of the bolts11 will force the tread member 13 to be tightly gripped by the flanges?and have the inner face of the member 13 forced into tight frictionalengagement with the inwardly slanted faces 6 of the half clamp members,thus avoidingv all danger of gripping or slipping V of the auxiliarytread member 13 in the half clamp member rim channel.

It will be observed that the half clamp members are made of rigid metalof sufficient thickness and strength to withstand thev impactof stoneshocks which would ordinarily dent a sheet metal structure, such as hasheretofore been suggested for tirearmor, and thus prevent the stonesfrom bruising the pneumatic tire 0r injuring it in anyway.

With the use of our invention, the life of a pneumatic tire isindefinitely increased. and

should the auxiliary tread member 13 wear down to the rim, it can beeasily replaced with a fresh auxiliary tread member, it being understoodthat the depth or. thickness of the auxiliary tread member 13 is notgreat enough to interfere with the use of the invention on the diametersof wheels on which it can be used without danger of increasing 7 thewheel diameter to a degree sufficient to cause the fenders or runningboard tobe engaged thereby. It should be stated that the invention isespecially adapted for use on automobiles of all types includingpleasure vehicles and trucks.

From the foregoing description, taken in connection with theaccompanying drawings, it is thought the complete construction,operation and advantages of our invention will be readily understood.

What we claim is: V

1. In combination with an inflated tire; a pair of half clamp memberseach comprising a body portion and'side flanges having: concaved tireengaging faceswhich extend over the tread surface area of the tire andproject over the sides of the tire to aplace near the transverse middleline thereof, said half clamp members each 1 also having; an annu'lartread rim face and a side flange, said body portions having transversebolt holes, a solid tire tread member held against said rim faces andengaged by said side flanges, clamp bolts passing through'said boltholes having pr0-' a body portion and side flanges having concaved tireengaging faces which extend over the tread surface area of the tireandiproject over-the sides of the t re in a place near the.transversem-iddle line thereof,said half clamp members each alsohavingan annular tread rimface and-a side flange, said body portionshaving'transverseboltholes, a solid tire. tread member heldagainst'rsaid rim V facesand engaged: by said side flanges, clamp boltspassing through said'ibolt holes hav- W ing provision for securing-saidhalf clamps together and applying retammg pressure to clamp the same. onthe inflatedtire andfsi multaneously compresstheisolid tire tread in therim space formed by the. opposing half clamp member, the rimcsurfaces ofthe respective half clamp members sloping from the side flangesvinwardly toward the center and: thev solid tread tire having its;opposed face held in frictionale-ngagement with said sloping surfaces byvirtue of the compression strains applied through; the clamping actionof said half clamp members. i v

3. In combination withian inflated tire; a-

pair of rigid or non-yieldablehalf clamp members each: comprising a bodyportion and side clencher flanges having concaved tire engaglng faces.which extenclover the tread surface area of thetireand projectover thesides of the tire to a place near the trans- T verse middle linethereof, said: half'clamp members each alsohaving an annular tread rimface and a s de clencher flange, said body portions havmg transversebolt holes, asolid 7 tlre tread member held against saidrim faces andengaged by the side clencherifianges,

clamp bolts passing through said bolt holes having provis on forsecuring; said half clamps together and applying retaining-pressure toclamp the same on the inflated tire and simultaneously compress thesolid ftire treadoin the run space formed the opposing half clampmember.

4. In combinationwith an inflatedtire; a if members each comprising abody portion and side clencher flanges havmg: concavedtransversemiddlexline thereof; said half pair of rigid or. nonsyieldablehalf clamp i j clamp members each also having an annular tread rim faceand a side clencher flange, said body portions having transverse boltholes, a solid tire tread member held against said rim faces and engagedby said side clencher flanges, clamp bolts passing through said boltholes having provision for securing said half clamps together andapplying retaining friction to clamp the same on the inflated tire andsimultaneously compress the solid tiretread in the rim space formed byCopies of this patent may be obtained for five cents each,

the opposing half clamp members, the rim surfaces of the respective halfclamp members sloping from the side clencher flanges inwardly toward thecenter and the solid tread tire having its opposed face held infrictional engagement with said sloping surfaces by virtue of thecompression strains applied through the clamping action of said halfclamp members.

' ARCADE G. BOIVIN.

FRED. J. DAVIGN ON.

by addressing the Commissioner of Fatenta,

Washington, D. 0.

